Broke receiver chamber for the dryer section of a papermaking machine

ABSTRACT

A broke receiver chamber located beneath the dryer section of a papermaking machine which includes an upper door assembly which provides access to the chamber for the broke, a lower door which allows removal of the broke from the chamber, and either seals or an upper door operating system which precludes passage of air upwardly from the chamber into the dryer section. The upper door assembly may comprise a first set of doors and a second set of doors therebeneath with an air lock inbetween, the upper door operating system including a motor and a first door actuator connected to the first set of doors and a second door actuator connected to the second set of doors and an interlock within a controller to prevent simultaneous opening of the first and second doors.

United States Patent Williams 1 June 13, 1972 [54] BROKE RECEIVER CHAMBER FOR THE DRYER SECTION OF A PAPERMAKING MACHINE FOREIGN PATENTS OR APPLICATIONS 695,920 10/ 1 964 Canada 162/191 Primary Examiner-S. Leon Bashore Assistant E.\-aminerRichard l-l. Tushin AttorneyRaymond A. Eckersley, Frank L. Neuhauser, Oscar B. Waddell and Joseph B. Forman [57] ABSTRACT A broke receiver chamber located beneath the dryer section of a papermaking machine which includes an upper door assembly which provides access to the chamber for the broke, a lower door which allows removal of the broke from the chamber, and either seals or an upper door operating system which precludes passage of air upwardly from the chamber into the dryer section. The upper door assembly may comprise a first set of doors and a second set of doors therebeneath with an air lock inbetween, the upper door operating system including a motor and a first door actuator connectedto the first set of doors and a second door actuator connected to the second set of doors and an interlock within a controller to prevent simultaneous opening of the first and second doors.

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BROKE RECEIVER CI'IAMBER FOR THE DRYER SECTION OF A PAPERMAKING MACHINE DESCRIPTION OF THE INVENTION This invention is directed to a broke chamber for use with a paper machine, for the recovery of paper broke or other pulp waste products which occur in the function of the dryer section of the machine.

In the operation of dryer sections of paper machines quantities of paper broke occur during the threading and operation of the section which must be removed from the machine.

These quantities of broke are carried by the machine felts to three primary positions. At the first of these, adjacent the sweat dryer there is often provided a broke disposer in which the broke is mechanically masticated, hydrated and returned to the stock system feeding the paper machine. The other broke deposit locations are at the No. l dryer on the infeeding side, and at the dryer adjacent the breaker stack.

Owing to the enclosure of the dryer section within a drying hood the environment of the basement beneath the machine is generally too hot to permit access by workers to the basement to remove the broke.

The present invention is directed to the provision of one or more broke chambers or receivers located beneath the dryer section, having an air lock provision to permit control of broke chamber environment without disruption to the operation of the dryer section. Owing to the need to maintain constant conditions within a dryer section it is imperative that variations of air temperature and thermal conditions within the hood shall be closely controlled during regular operation. The present invention permits such control while at the same time making possible the safe and comfortable removal of broke at the two latter locations, while avoiding the complexity and high cost generally associated with a broke disposer installation of the type previously referred to.

Thus there is provided beneath the run of a pulp product dryer a chamber to receive waste products such as paper broke, having a first entrance at the top of the chamber communicating with the full width of the dryer section to provide entry of waste product therethrough, door means operable from an open position to a closed position to substantially preclude the passage of air from the chamber upwardly into the dryer, and a second entrance providing access to the chamber for the removal of broke therethrough.

Certain embodiments of the present invention are described, reference being had to the accompanying drawings, wherein;

FIG. 1 shows a side sectional elevation of a dryer section incorporating broke chambers according to the present invention;

FIGS. 2, 3 and 4 show alternative embodiments of broke chamber doors; and

FIG. 5 shows a door operation system.

In FIG. 1 of the drawings the incoming portion of the dryer which receives the paper web 12 includes a plurality of dryer drums l4, 16, 18, together with support felts passing over guide rolls 22 and a felt drying roll 24, and providing support to the web 12.

At the outgoing side of the dryer the web 12 passes over final drums or cylinder to a breaker stack (not shown).

Beneath the operating floor level 48 of the dryer section there is a basement portion having a floor 50. This basement accommodates the return run of the felt 20.

The drums 14 and 40 are provided with doctor blades 42,

v 44 respectively.

Closely adjacent the drum 16 at the oncoming end there is provided a broke receiver chamber 70 having an access or upper door assembly 60 communicating with the dryer section.

The upper door assembly 60 comprises a closure member 61 pivotally mounted at 62 and having an air actuator 63 operatively attached thereto. Edge seals 64, 65 minimize the passage of air upwardly from the chamber 70 into the dryer section. The chamber 70 is bounded by walls 72, 72, 74, and 74.

A corresponding broke chamber 80 is provided at the offgoing end of the dryer adjacent the breaker stack, and having an entry door assembly 60 similar to that previously described.

Bottom access to the chambers 70, 80 is provided through apertures in the walls such as wall 74 of chamber 70, and closed by lower doors 76, 86, which communicate with the cool open portion of the basement outside of the hood enclosure.

In operation when a accumulation of broke occurs during threading or operation of the dryer the door 61 may be swung open either manually or by control from a broke alarm system, permitting entry of broke into the respective chamber 70 or 80. When the chamber is full, or when the deposition of broke terminates the door 61 is closed to seal off the dryer section from the lower chamber 70 or 80, as the case may be. The respective chamber 70 or 80 is then ventilated by operation of the respective lower door 76, 86 in order to reduce the temperature within the broke chamber to a safe working level. When this is achieved, the chamber may then be entered and the broke removed.

In order to minimize the thermal problems encountered, it is contemplated that heating provision for the chamber 70 may be provided in order to equalize the temperature therein with that of the drier section, for example by opening doors 88 and 89 to communicate with the lower portion of the hood enclosure.

It will be understood that the hood enclosing the drier section is not illustrated.

Referring to the alternative upper door arrangements illustrated in FIGS. 2 and 3, in FIG. 2 there is provided a rotating door 261, to provide uninterrupted sealing of the broke chamber 270. Thedoor seal portions 264 serve also to sever the broke at the edge 265 of the broke sump 266. The relationship of chamber walls 272, 272E274, 274' is indicated schematically. In FIG. 3, first doors 361, 362 which are pivotally mounted at 365, 366 for downward opening movement and provide access to a lock space 370 into which the broke passes, for subsequent release into the main chamber 70 therebeneath. Access from the lock 370 to the broke chamber 70 (not shown) is provided by a second set of insulated second doors 380 located therebeneath suspended from the walls 385.

As illustrated in FIGS. 4 and 5 a plurality of broke paddles 367 rotatably mounted on shaft 368 for rotation about the axis 365 of the respective door 361 serve to pass broke downwardly past the open doors, while also sealing the paddle apertures 369 when the doors are in the closed positions. The

' broke chamber boundary walls are indicated schematically in FIG. 4. As shown in FIG. 5, the pneumatic door operating system 390 includes first door actuator 391, of the piston and cylinder type for opening and closing doors 361, 362; and second door actuator 392 for opening and closing the second doors 380. The air supply 393 is controlled by a broke sensor 394.

A rotatable motor 395, also sequentially controlled from the controller air supply 393 drives paddles 367 while the doors 361 are open. An interlock in the controller 393 prevents the doors 380 being opened at the same time that doors 361, 362 are open, and vice versa.

The sealing of lock space370 when the second doors 380 are to be opened, includes sealing of the paddle apertures 369 in doors 361, by the positioning of a broke paddle 367 in the respective aperture, referred to above. This sequence is effected by the controller 393, to prevent upward drafts through the paddle apertures, on opening of the second doors 380.

What I claim as new and desire to secure by Letters Patent I of the United States is:

1. In a pulp product machine having a dryer section, the improvement comprising wall means defining an enclosed broke receiver chamber located beneath the section, said wall means having a first aperture defining an upper entrance communicating with the dryer section, upper door means at said entrance operable to provide unobstructed passage for waste product from the section through the entrance, door operator means connected to said upper door means for opening said aperture to permit passage of broke therethrough from said dryer section to said chamber and seal means to substantially preclude the passage. of air upwardly from the chamber through said aperture into the section when said door means is in a closed position, said wall means having a lower, second aperture defining a second chamber entrance and lower door means therefor, providing access to the chamber for the removal of waste product therethrough.

2. The chamber as claimed in claim 1 wherein said upper door means comprisesa rotatable door having at least three portions in angularly spaced relation about a common axis of rotation to provide substantially continuous air sealing' between said chamber andsaid dryer section, for sealed downward passage of said waste product.

3. The chamber as claimed in claim 1 wherein said upper door means comprises at least a first door means to provide downward access of said waste product into a lock, and a second door means therebeneath to provide an exit downwardly from the lock, and including means interconnecting said first door means and second door means to preclude simultaneous opening thereof, whereby upward ventilation of said dryer section is substantially precluded.

4. The chamber as claimed in claim 3 wherein said first door means includes a plurality of rotatable broke paddles to provide downward feeding of said waste product, said paddles passing through third apertures in said first door means, and control means to position a said paddle in each said third aperture in substantial blocking relation therewith on opening of said second door means, whereby the prevention of upward ventilation therepast is maintained. 

2. The chamber as claimed in claim 1 wherein said upper door means comprises a rotatable door having at least three portions in angularly spaced relation about a common axis of rotation to provide substantially continuous air sealing between said chamber and said dryer section, for sealed downward passage of said waste product.
 3. The chamber as claimed in claim 1 wherein said upper door means comprises at least a first door means to provide downward access of said waste product into a lock, and a second door means therebeneath to provide an exit downwardly from the lock, and including means interconnecting said first door means and second door means to preclude simultaneous opening thereof, whereby upward ventilation of said dryer section is substantially precluded.
 4. The chamber as claimed in claim 3 wherein said first door means includes a plurality of rotatable broke paddles to provide downward feeding of said waste product, said paddles passing through third apertures in said first door means, and control means to position a said paddle in each said third aperture in substantial blocking relation therewith on opening of said second door means, whereby the prevention of upward ventilation therepast is maintained. 